JP6822782B2 - Two-layer woven fabric for non-woven fabric - Google Patents

Description

The present invention relates to a two-layer woven fabric for non-woven fabric in which the surface density of the woven fabric supporting the non-woven fabric is kept constant, and at the same time, the dehydration property and the air permeability inside the woven fabric are improved as compared with the conventional woven fabric. The present invention can also improve the insertion of fibers in the production of a non-woven fabric, and can add the required characteristics of excellent horizontal rigidity, naname rigidity, and sheet support to a two-layer woven fabric for non-woven fabric.

Currently, a plurality of methods for producing a non-woven fabric are known. For example, in the spunbond manufacturing method, the non-woven fabric used is required to have characteristics such as horizontal rigidity, air permeability, and seat support. In a non-woven fabric manufacturing machine, since the non-woven fabric for non-woven fabric moves in the lateral direction during traveling, it is necessary to correct the movement by hitting a palm. Therefore, if the horizontal rigidity of the non-woven fabric used is low, there is a problem that the non-woven fabric itself is broken due to interference by the palm.
Further, the air permeability required for the woven fabric for non-woven fabric needs to be appropriately set depending on the woven fabric to be woven. If the air permeability of the woven fabric is too high, the fibers will fall out, and if it is too low, the vacuum effect will be reduced. Further, if the sheet supportability is low, there is a problem that when the non-woven fabric is transported, the formed non-woven fabric moves on the woven fabric and is folded.

Specifically, the conventional woven fabric shown in FIG. 19 in Patent Document 1 has been used. Such a conventional woven fabric has very good air permeability in the initial state, but there is a problem that fibers contained in the work piece are pierced into the woven fabric over time due to repeated use in the manufacturing process of the non-woven fabric. Was occurring. Here, the insertion of fibers is a phenomenon in which fibers enter between knuckle intersections of wires. When the fibers are pierced, problems such as the wire biting the non-woven fabric and the air permeability of the woven fabric are lowered.
Further, in general, a knuckle hung on one thread tends to have a strong intersection bearing capacity, and a long knuckle hung on a plurality of threads tends to have a low intersection bearing capacity. Therefore, it is known that the structure having the highest intersection bearing capacity is a plain weave structure. In the plain weave structure, since all the knuckles form a knuckle that hangs on one thread, the knuckle density is the highest, and the intersection bearing capacity is also high.
However, in a general non-woven fabric, it is difficult to produce a plain weave structure because the surface density decreases when the weft has a large diameter, and the weft rigidity and the surface density conflict with each other.
In order to solve such problems, a multilayer woven fabric for non-woven fabrics having excellent air permeability, horizontal rigidity, fiber piercing, surface density, name rigidity, and sheet supportability has been invented (Patent Document 2).

On the other hand, the woven fabric is formed by weaving warp threads and weft threads. Each woven thread changes its shape by bending at various angles. Further, when the woven fabric is heat-treated, tension is applied to the warp yarns, so that the woven yarns tend to be significantly deformed in the weft yarn direction. That is, it is well known that the woven fabric curls in the width direction.
In addition, various threads are known to form a woven fabric. For example, polyester, polyamide, polyphenylene sulfide, polyvinylidene fluoride, polypro, aramid, polyetheretherketone, polyethylene naphthalate, and polytetrafluoroethylene can be used as the yarns constituting the woven fabric.
However, when the above-mentioned yarn is used for a woven fabric, the yarn shrinks when the woven fabric is heat-treated, so that curling in the width direction of the woven fabric is more likely to occur. In addition, in the two-layer woven fabric, the wire diameters of the threads on the front side woven fabric and the back side woven fabric are often different, and the number of threads constituting the front side woven fabric and the back side woven fabric is often different.
Due to the combined action of such factors and the difference in shrinkage force between the front side woven fabric and the back side woven fabric, curling in the width direction of the woven fabric is more likely to occur.
The problem of curling of such a woven fabric is also found in the multilayer woven fabric for non-woven fabric disclosed in Patent Document 2, and an effective means for solving this problem has not been found so far.

Japanese Unexamined Patent Publication No. 2-68384 International Publication WO2012 / 140992

An object of the present invention is to maintain uniform surface density in a woven fabric that supports a non-woven fabric, and at the same time, to improve dehydration and air permeability inside the woven fabric as compared with a conventional woven fabric. In addition, the present invention improves the fiber sticking that occurs when manufacturing a non-woven fabric, and adds the required characteristics such as excellent horizontal rigidity, naname rigidity, and sheet support to a two-layer woven fabric for non-woven fabric. The purpose.

The two-layer woven fabric for non-woven fabric according to the present invention improves the problem of fiber piercing, is excellent in air permeability and horizontal rigidity, and improves surface density, naname rigidity, sheet supportability, and horizontal rigidity. The present invention employs the following configurations in order to solve the above problems of the prior art.
(1) In a two-layer woven fabric for non-woven fabric consisting of a front surface layer consisting of a front surface side warp yarn and a front surface side weft yarn, a back surface side warp yarn, and a back surface layer consisting of a back surface side weft yarn, a front side knotting warp and a knotting yarn functioning as a binding yarn A first pair of warp threads in which the back side woven warp threads are arranged substantially vertically, and a second warp thread pair in which the front surface side warp threads and the back surface side warp threads are vertically overlapped, and two threads. This is a two-layer woven fabric for non-woven fabric, which comprises a third warp yarn pair in which the surface side warp yarns of the above are arranged side by side.
(2) The complete structure of the two-layer woven fabric for non-woven fabric has 16 warp threads, and the 16 warp threads are two sets of the first warp thread pair, four sets of the second warp thread pair, and two sets. The two-layer woven fabric for non-woven fabric according to the above (1), which is composed of the third vertical knot pair of the above.

(3) The wire diameters of the warp yarns constituting the first to third warp yarn pairs are φ0.30 to φ0.50 mm, the wire diameters of the front surface side weft yarns are φ0.30 to φ0.70 mm, and the back surface side weft yarns. The two-layer woven fabric for non-woven fabric according to (1) or (2) above, wherein the wire diameter of the above is φ0.30 to φ0.70.
The wire diameter of the warp in the present invention is preferably φ0.30 to φ0.50 mm. If the wire diameter of the warp is less than φ0.30, it may not be possible to obtain an excellent effect in terms of surface density, sheet support, rigidity, and the like. On the other hand, if the wire diameter of the warp exceeds φ0.50 mm, it may not be possible to obtain an excellent effect from the viewpoint of air permeability, dehydration and the like.
(4) Any of the above (1) to (3), characterized in that, in the two-layer woven fabric for non-woven fabric, the opposing ends of the warp threads are joined by loop joining to form an endless shape. The two-layer woven fabric for non-woven fabrics described in 1.
(5) The two-layer woven fabric for non-woven fabric according to any one of (1) to (4) above, wherein at least a part or all of the second warp yarn pair is formed of carbon wire.
(6) The two-layered non-woven fabric according to any one of (1) to (5) above, wherein the woven fabric of the front-side woven fabric and the back-side woven fabric is a plain weave. It is a woven fabric.

The two-layer woven fabric for non-woven fabric according to the present invention has the effect of uniformly maintaining the surface density of the woven fabric supporting the non-woven fabric, and at the same time improving the dehydration property and air permeability inside the woven fabric as compared with the conventional woven fabric.
Further, the two-layer woven fabric for non-woven fabric according to the present invention has the effect of suppressing the sticking of fibers generated during the production of the non-woven fabric and satisfying the excellent required characteristics such as horizontal rigidity, naname rigidity and seat support. Play.

It is a design drawing which shows the complete structure of the two-layer woven fabric for a nonwoven fabric which concerns on Embodiment 1 of this invention. It is a figure which shows typically the vertical sectional view cut along the warp thread in FIG. 1.

Hereinafter, the structure and action / effect of the two-layer woven fabric for non-woven fabric according to the present invention will be described. After that, the embodiment of the two-layer woven fabric for non-woven fabric according to the present invention will be described in detail with reference to the drawings.
In the two-layer woven fabric for non-woven fabric according to the present invention, the front side woven fabric composed of the front surface side warp yarn and the front surface side weft yarn and the back surface side woven fabric composed of the back surface side warp yarn and the back surface side weft yarn are bonded to the front surface side which functions as a binding yarn. It is formed by binding with a backside side tie yarn that functions as a tie yarn with the yarn.
In the two-layer woven fabric for non-woven fabric according to the present invention, a first warp yarn pair in which a front side tie yarn functioning as a tie yarn and a back side tie yarn functioning as a tie yarn are arranged in substantially vertical directions, and It is composed of a second warp yarn pair in which the front surface side warp yarn and the back surface side warp yarn are arranged in the vertical direction, and a third warp yarn pair in which two front surface side warp yarns are arranged adjacent to each other.
Here, the front-side tie-knot that functions as a tie-knot is a warp that should normally be a front-side warp due to the configuration arrangement of the warp in the complete structure of the two-layer woven fabric for non-woven fabric, and the back-side weft is the back-side. It is a yarn that functions as a knotting yarn by weaving from, and the backside side knotting yarn that functions as a knotting yarn is originally the back side due to the composition arrangement of the warp yarn in the complete structure of the two-layered non-woven fabric. The warp yarn that should be the warp yarn is a yarn that functions as a knotting yarn by weaving the surface side weft yarn from the surface side.
Then, the first warp yarn pair passes under the back surface side weft at the place where one front surface side tie yarn passes over the front surface side weft and then passes over the next front surface side weft due to the structure of the plain weave fabric. Is woven. At the portion passing over the front surface side weft, another back surface side tie yarn is woven by passing over the front surface side weft. That is, it is characterized in that the two knotted yarns alternately complement the knuckles on the surface side to form a plain weave on the surface.

Further, in the second warp yarn pair, the front surface side warp yarn and the back surface side warp yarn are arranged in the vertical direction to form a pair. By weaving the front surface layer and the back surface layer in the vertical direction in this way, the two-layer woven fabric for non-woven fabric can satisfy the required characteristics of the woven fabric such as horizontal rigidity and naname rigidity at a high level. Further, since it does not have a binding structure, the tension of the warp threads is weaker than that of the first warp thread pair, so that it has an action of alleviating the insertion of fibers.
Further, in the present invention, one of the two front surface side warp yarns that form the third warp yarn pair is the front side warp yarn that originally constitutes the back surface side warp yarn due to the structure of the woven fabric. It is characterized in that it is woven with the weft threads on the surface side to form a woven fabric on the surface side.
As described above, the two-layer woven fabric for non-woven fabric according to the present invention has a third warp yarn pair as an essential configuration, so that the number of warp yarns on the front surface side of the woven fabric is larger than the number of warp yarns on the back surface side, and the surface density is increased. , It also has the effect of significantly relaxing the intersection bearing capacity. In addition, since the number of warp threads on the back surface side is small, the air permeability and dehydration are excellent.
Then, in the present invention, the warp threads appearing on the surface side of the second warp thread pair and the third warp thread pair can improve the insertion of fibers, which is one of the problems of the prior art.

Further, in the two-layer woven fabric for non-woven fabric according to the present invention, it is preferable that the complete structure of the front side woven fabric and the back side woven fabric is formed by plain weave.
In the present invention, the complete structure is the smallest repeating unit for forming a woven fabric structure, and this is repeated back and forth and left and right to form a woven fabric.

In the present invention, it is possible to use a weft with a large diameter or a small diameter while having a surface plain weave structure. In the conventionally adopted structure of a two-layer woven fabric for non-woven fabric, if a large-diameter weft yarn is used as the plain weave structure, the surface density becomes low. However, in the present invention, since the warp threads are provided in each of the first warp thread pair, the second warp thread pair, and the third warp thread pair, the back surface side weft thread has a large diameter weft thread, and the front surface side has a smaller diameter. It is also possible to increase the surface density while using a large diameter weft by using a weft. Further, by using a thick weft for the front weft and a thin weft for the back weft, the air permeability can be improved.
Specifically, the wire diameter difference of the back surface side weft with respect to the front surface side weft may be formed within ± 20% of the wire diameter of the front surface side weft. If the wire diameter of the weft on the front surface side exceeds the wire diameter of the weft on the back surface side by more than 20%, there arises a problem that the balance of the net becomes poor or it becomes difficult to form a loop. In the two-layer woven fabric for non-woven fabric according to the present invention, the air permeability and surface smoothness can be adjusted by adjusting the front surface side weft and the back surface side weft within a range of ± 20%.

The yarn used in the present invention may be selected depending on the intended use. For example, in addition to monofilament, multifilament, spun yarn, generally textured yarn, bulky yarn, stretch yarn, etc. that have been subjected to crimping or bulk processing, etc. It is possible to use the so-called processed yarns or yarns that are combined by twisting them together. Further, the cross-sectional shape of the thread is not limited to a circular shape, but a short shape such as a quadrangular shape or a star shape, an elliptical shape, or a hollow shape can be used. In addition, the material of the thread can be freely selected, and polyester, polyamide, polyphenylene sulfide, polyvinylidene fluoride, polypro, aramid, polyetheretherketone, polyethylene naphthalate, polytetrafluoroethylene, cotton, wool, metal, etc. are used. it can. Of course, a copolymer or a yarn in which various substances are blended or contained in these materials may be used depending on the purpose. In general, it is preferable to use a polyester monofilament which has rigidity and is excellent in dimensional stability as the yarn constituting the woven fabric for non-woven fabric.

Further, in the present invention, carbon wire can be used for a part or all of the second warp thread pair. When manufacturing a non-woven fabric, the wire may be charged by static electricity. In that case, the charged wire and the fiber of the non-woven fabric repel each other, and the non-woven fabric cannot be formed on the wire. Therefore, by using carbon wire for a part or all of the second warp, it is possible to remove static electricity from the wire. It should be noted that the case where the carbon wire is used for other than the second warp (for example, the front or back side weft) is not excluded from the scope of the present invention.
The wire diameter of the woven fabric constituent yarns is not particularly limited, but in order to obtain a dense and smooth woven fabric surface, the surface side warp yarns and the surface side weft yarns constituting the surface side layer must have relatively small wire diameters. preferable. Further, since the back surface side surface which is the contact surface of the machine or the roll is required to have rigidity and abrasion resistance, it is preferable that the back surface side weft threads and the back surface side warp threads are threads having a relatively large wire diameter. These may be selected in consideration of the application, the usage environment, the arrangement ratio of the number of upper and lower weft threads, and the like.

Further, in the two-layer woven fabric for non-woven fabric according to the present invention, it is preferable that the vertical end portion is endless by loop joining.
Here, the loop joint can form a loop forming portion by leaving at least one weft at the end of the woven fabric. Then, in the loop forming portion, all or a part of the warp yarns at one side end portion or both side end portions of the woven fabric is folded back to form a loop, which is appropriately woven with the weft yarn to form a joining loop. A common hole for inserting the core wire may be formed below the weft by engaging the plurality of loops.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. Here, the design drawing is the smallest repeating unit of the woven fabric structure and corresponds to the complete structure of the woven fabric. The woven fabric described in the claims according to the present invention corresponds to this complete structure. The final product is completed by arbitrarily joining the complete structure vertically and horizontally.
In each design drawing, the warp threads are indicated by Arabic numerals, for example 1, 2, 3 ...
The weft is indicated by an Arabic numeral with a dash, for example, 1', 2', 3'... The front side yarn is indicated by a number with U, and the back side yarn is indicated by a number with L, for example, 1'U, 2'L and the like. Further, the knotting yarn for connecting the front side woven fabric and the back side woven fabric is indicated by a number with b.
In the design drawing, the ▲ mark indicates that the threads that originally constitute the back surface side warp threads in the first warp thread pair are arranged on the front surface side weft threads, and the × mark indicates that in the first warp thread pair. A surface-side knot, a second warp pair or a third warp pair, which functions as a knot, indicates that the surface-side warp is arranged on the surface-side weft, and a Δ mark indicates the first warp. The front side tie that functions as the tie in the pair indicates that the front side tie is placed under the back side weft, and the circles indicate the back side tie that functions as the tie in the first warp pair. It indicates that the back surface side warp threads in the second warp thread pair or the third warp thread pair are arranged below the back surface side weft threads.
In the following description of the present embodiment, the knuckle is a portion where one or more warp threads are above or below the weft threads and protrudes to the surface, and the crimp is above or below the warp threads having a plurality of weft threads. A long float formed on the surface through the surface.

Embodiment 1
FIG. 1 is a design diagram showing the complete structure of the two-layer woven fabric for non-woven fabric according to the first embodiment of the present invention. Further, FIG. 2 shows a cross-sectional view taken along the warp in the design drawing shown in FIG. Further, in FIG. 1, the third warp yarn pair (4U and 4L and 8U and 8L) is described in two rows for convenience because the surface side warp yarns are juxtaposed.
The two-layer woven fabric for non-woven fabric according to the first embodiment shown in FIG. 1 has one first warp pair (1Ub and 1Lb), two second warp pairs (2U and 2L and 3U and 3L) from the left side. Third warp pair (4U and 3L), one first warp pair (5Ub and 5Lb), two second warp pairs (6U and 6L and 7U and 7L), one third warp pair (8U) And 8L), and a surface plain weave structure composed of front surface side weft threads 1'U, 2'U, 3'U, 4'U and back surface side weft threads 1'L, 2'L, 3'L, 4'L. It is a two-layer woven fabric by.

As shown in FIG. 2, the front surface side warp yarn 1Ub that functions as a knotting yarn constituting the first warp yarn pair passes under the back surface side weft yarn 1'L to form a back surface side knuckle, and then the front surface side weft yarn 2 After passing between the'U and the back side weft 2'L, and then passing above the front side weft 3'U to form a front side knuckle, the front side weft 4'U and the back side weft 4'L It is woven through the space. Further, the back surface side warp yarn 1Lb which functions as a knotting yarn constituting the first warp yarn pair passes above the front surface side weft yarn 1'U to form a front surface side knuckle, and then the front surface side weft yarn 2'U and the back surface side. After passing between the weft 2'L and the back side weft 3'L to form a back side knuckle, it passes between the front side weft 4'U and the back side weft 4'L. Is woven together.
Further, the surface side warp 2U constituting the second warp pair passes under the surface side weft 1'U and then passes above the surface side weft 2'U to form a surface side knuckle, and then the surface. After passing under the side weft 3'U, it is woven so as to pass above the front weft 4'U and form a surface side knuckle again. Further, the back surface side warp yarn 2L constituting the second warp yarn pair passes above the back surface side weft yarn 1'L and then passes under the front surface side weft yarn 2'L to form a back surface side knuckle, and then the back surface side knuckle. After passing through the upper side of the side weft 3'L, it is woven so as to form a back side knuckle again through the lower side of the back side weft 4'L.
Further, the surface side warp 3U constituting the second warp pair forms a surface side knuckle through the upper side of the surface side weft 1'U, and then passes under the surface side weft 2'U, and then the surface. After forming the surface side knuckle again through the upper side of the side weft 3'U, it is woven under the surface side weft 4'U. Further, the back surface side warp 3L constituting the second warp thread pair passes under the back surface side weft 1'L to form a back surface side knuckle, then passes above the back surface side weft 2'L, and then passes through the back surface. After forming the back surface side knuckle again through the lower side of the side weft 3'L, it is woven by passing over the back surface side weft 4'L.

Further, the surface side warp 4U constituting the third warp pair passes under the surface side weft 1'U and then passes above the surface side weft 2'U to form a surface side knuckle, and then the surface. After passing under the side weft 3'U, it is woven so as to pass above the front weft 4'U and form a surface side knuckle again. Further, the surface side warp 4U constituting the third warp pair passes above the surface side weft 1'U to form a surface side knuckle, then passes under the surface side weft 2'U, and then passes through the surface. After forming a surface side knuckle through the upper side of the side weft 3'U, it is woven through the lower side of the surface side weft 4'U.
Further, the front surface side warp yarn 5Ub that functions as the knotting yarn that constitutes the first warp yarn pair passes between the front surface side weft yarn 1'U and the back surface side weft yarn 1'L, and then the front surface side weft yarn 2'U. The front side knuckle is formed through the upper side, then the front side weft 3'U and the back side weft 3'L are passed, and then the back side knuckle is formed through the lower side of the back side weft 4'L. doing. Further, the back surface side warp yarn 5Lb that functions as the knotting yarn that constitutes the first warp yarn pair passes between the front surface side weft yarn 1'U and the back surface side weft yarn 1'L, and then the back surface side weft yarn 2'L. The back side knuckle is formed through the lower side, then the front side weft 3'U and the back side weft 3'L are passed, and then the front side knuckle is formed through the upper side of the front side weft 4'U. doing.

Further, the surface side warp 6U constituting the second warp pair forms a surface side knuckle through the upper side of the surface side weft 1'U, and then passes under the surface side weft 2'U, and then the surface. After forming the surface side knuckle again through the upper side of the side weft 3'U, it is woven under the surface side weft 4'U. Further, the front surface side warp 6L constituting the second warp thread pair passes under the back surface side weft 1'L to form a back surface side knuckle, then passes above the back surface side weft 2'L, and then passes through the upper side. The back side knuckle is formed again through the lower side of the back surface side weft 3'L, and then woven through the upper side of the back surface side weft 4'L.
Further, the surface side warp 7U constituting the second warp pair passes under the surface side weft 1'U and then passes above the surface side weft 2'U to form a surface side knuckle, and then forms a surface side knuckle. After passing under the surface side weft 3'U, the surface side knuckle is formed again through the upper side of the surface side weft 4'U. Further, the front surface side warp 7L constituting the second warp thread pair passes above the back surface side weft 1'L and then passes under the back surface side weft 2'L to form a back surface side knuckle. After passing through the upper side of the back surface side weft 3'L, the back surface side knuckle is formed again through the lower side of the back surface side weft 4'L.
Further, the surface-side warp 8U constituting the third warp pair passes above the surface-side weft 1'U to form a surface-side knuckle, then passes under the surface-side weft 2'U, and then passes through the surface. After forming the surface side knuckle again through the upper side of the side weft 3'U, it is woven through the lower side of the surface side weft 4'U. Further, the surface-side warp 8U constituting the third warp pair passes under the surface-side weft 1'U, passes above the surface-side weft 2'U, forms a surface-side knuckle, and then passes. After passing under the surface side weft 3'U, the surface side knuckle is formed again through the upper side of the surface side weft 4'U.

By having the above-mentioned structure, the two-layer woven fabric for non-woven fabric according to the first embodiment forms a plain weave structure on the surface. By regularly forming a plain weave structure on the surface, the surface density of the woven fabric supporting the non-woven fabric is uniformly maintained, and the sheet supportability is improved.
Further, by arranging three pairs of the second warp and the third pair of warp between the two pairs of the first warp existing in the complete structure, the intersection bearing force generated on the surface side knuckle of the knotted yarn is generated. By relaxing the entire woven fabric, it is possible to prevent fiber sticking.
Further, by arranging two pairs of second warp threads side by side, the rigidity of the woven fabric can be enhanced. Therefore, the weft rigidity and the naname rigidity of the woven fabric can be improved without arranging the auxiliary weft threads or the like inside the woven fabric.

1U, 3U, 4U, 5U, 7U, 8U, 9U, 10U Front side warp 3L, 4L, 57L, 8L, 9L, 10L Back side warp 2Ub, 6Ub Front side tie yarn 2Lb, 6Lb Back side tie yarn 1LU, 5LU Due to the arrangement of the woven fabric, the front side warp 2'U, 4'U, 6'U, 8'U front side weft 2'L, 4 which originally constitutes the second warp pair which constitutes the back side warp. 'L, 6'L, 8'L Back side weft 1'S, 3'S, 5'S, 7'S Auxiliary weft

Claims (5)

In a two-layer woven fabric for non-woven fabric consisting of a front surface layer consisting of front surface side warp threads and front surface side weft threads and a back surface layer consisting of back surface side warp threads and back surface side weft threads, it functions as a front side knotting warp and a knotting yarn. A first pair of warp threads in which the back side woven warp threads are arranged substantially vertically, a second warp thread pair in which the front surface side warp threads and the back surface side warp threads are arranged in a vertical direction, and two front surface sides. It consists of a third warp yarn pair in which the warp yarns are juxtaposed adjacent to each other . The weft yarn is composed of only the front side weft yarn and the back surface side weft yarn, and the wire diameter of the warp yarns constituting the first to third warp yarn pairs is φ0.30. a ～Fai0.50Mm, wire diameter of the surface side weft is Fai0.30～Fai0.70Mm, non-woven fabric bilayer wire diameter of the rear surface side weft is characterized Fai0.30～Fai0.70Mm der Rukoto fabric. The complete structure of the two-layer woven fabric for non-woven fabric has 16 warp threads, and the 16 warp threads are two sets of first warp threads, four sets of second warp threads, and two sets of third threads. The two-layer woven fabric for a non-woven fabric according to claim 1, wherein the two-layer woven fabric is composed of a vertical knot. The two-layer woven fabric for non-woven fabric according to claim 1 or 2 , wherein the opposite ends of the warp threads are joined to each other by loop joining to form an endless shape in the two-layer woven fabric for non-woven fabric. .. The two-layer woven fabric for non-woven fabric according to any one of claims 1 to 3 , wherein at least a part or all of the second warp yarn pair is formed of carbon wire. The two-layer woven fabric for non-woven fabric according to any one of claims 1 to 4 , wherein the woven fabric of the front-side woven fabric and the back-side woven fabric is a plain weave in the two-layer woven fabric for non-woven fabric.

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